Probably what's happened is that a small plastic tab on the battery cover door has been bent or broken. This means that the camera can't tell if the battery door is closed and it's safe to start up. You've seen how the battery is "keyed" so that it only goes in one way (without forcing it). When it is in the "wrong" way, there's no telling what little bits get pranged.
I could be more helpful if you described it more. But with your recent news, perhaps the point is moot. I believe that the camera is repairable though, based on the little you have shared here.
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